package cn.edu.seu.herald.informationplatform.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.edu.seu.herald.informationplatform.dao.database.ActivityClassDao;

public class ActivityClassesRequired implements Filter {
	
	private static final String ACTIVITY_CLASSES_NAME = "activityClasses";
	
	@Override
	public void init(FilterConfig config) throws ServletException {}

	@Override
	public void destroy() {}

	@Override
	public void doFilter(ServletRequest request,
			ServletResponse response, FilterChain chain)
					throws IOException, ServletException {
		HttpServletRequest httpRequest = (HttpServletRequest) request;
		HttpServletResponse httpResponse = (HttpServletResponse) response;
		
		try {
			ActivityClassDao dao = ActivityClassDao.getDao();
			httpRequest.setAttribute(ACTIVITY_CLASSES_NAME,
					dao.getActivityClassMap());
		} catch (Exception e) {
			httpResponse.sendError(500);
			return;
		}
		chain.doFilter(request, response);
	}

}
